Try to use solarisstudio12.3 compiler

instead of compiler in /opt/SUNWspro/bin
Thanks to Karl Behler
Don't delete libkopenafs.exp when cleaning

It's not produced by make, but part of the source tree.
Thanks to Karl Behler
Handle sun4x_510 and sun4x_511 differently

Karl Behler found out that these changes are necessary to build afs
in newer Solarises on sun4x platform.
Changes by Achim Gsell

In order to get rid of warnings and also because many format statements
where wrong and some parameters used pointers to objects instead of the
objects themselves Achim proposed many of these changes. There are also
changes in favour of DARWIN platform. PrintTime and PrintDate now take
the time as afs_uint32 instead of a pointer to afs_uint32.